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  • Open Access

    PROCEEDINGS

    High-Performance NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion: Orient to Functional Customization

    Kun Li1,2,3,*, Jianbin Zhan1,2, Ruijin Ma1,2, Jiahui Fang1,2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.30, No.4, pp. 1-2, 2024, DOI:10.32604/icces.2024.011742

    Abstract NiTi alloys exhibit shape memory (SME), superelasticity (SE), and elastocaloric (eCE) effects, making them well for use as functional structural components. However, their poor machinability often limits them to simple geometries like plates, rods, and tubes. Unlike Ti6Al4V, Ni-based superalloy, and other load-bearing materials, SMAs require a balance of geometry, mechanical, and functional properties during fabrication. Laser Powder Bed Fusion (LPBF) 3D printing technology provides a solution for manufacturing shape memory alloys (SMAs) with intricate geometries. Despite extensive knowledge of process-structure-property relationships of LPBFed NiTi alloy, successful applications have yet to be widely reported. The challenge… More >

  • Open Access

    PROCEEDINGS

    In-Situ Monitoring of Interplay Between Melt Pool, Spatter and Vapor in Laser Powder Bed Fusion Additive Manufacturing

    Xin Lin1,2,3, Kunpeng Zhu1,2,3,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.30, No.2, pp. 1-1, 2024, DOI:10.32604/icces.2024.012499

    Abstract This paper reveals the interplay mechanism between melt pool, spattering and vapors, aiming to further improve the forming quality through in-situ monitoring with a CMOS camera. A Residual Network based on Convolutional Block Attention Module and Focal loss function is proposed to extract multi-scale features of single tracks and learn about their behavior changes. A t-SNE clustering analysis is utilized to analysis a large amount of time sequence data on the melt pool by collecting the schlieren photographs. It is found that patterns of unstable melt pool changing corelate to the defects in single tracks, More >

  • Open Access

    PROCEEDINGS

    Recycling of Spent CuCrZr Powder by Laser Powder Bed Fusion: Microstructure Evolution and Properties

    Lizheng Zhang1,2, Jimin Chen1,2,*, Yong Zeng1,2,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.30, No.1, pp. 1-1, 2024, DOI:10.32604/icces.2024.011127

    Abstract In laser powder bed fusion (LPBF), the unmelted powder recovered from the powder bed is degraded due to particle-laser interaction during continuous processing. The sensitivity of LPBF performance and molding quality to powder properties, waste powder is usually discarded after several molding cycles, which increases the cost of raw materials. At the same time, the low laser absorption rate and high thermal conductivity of copper and copper alloys inhibit the complete melting of copper powder prepared by LPBF. Therefore, it is challenging to fabricate copper alloy components with full high density and high conductivity through… More >

  • Open Access

    PROCEEDINGS

    Mechanical Properties of CP Ti Processed via a High-Precision Laser Powder Bed Fusion Process

    Hui Liu1, Xu Song1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.29, No.2, pp. 1-1, 2024, DOI:10.32604/icces.2024.011362

    Abstract Because of its higher specific strength and better biocompatibility, commercially pure titanium (CP Ti) is widely used for product fabrication in the aerospace, medical, and other industries. Currently, different ways are adopted to strengthen CP Ti, such as solid-solution strengthening using oxygen or adding metal components to form alloys; however, the introduction of oxygen, other gases, or alloying elements reduces the corrosion resistance and biocompatibility. Herein, CP Ti with a low oxygen content was used to fabricate samples via a high-precision laser powder bed fusion process. Smaller laser beam diameter and thinner layer thickness lead More >

  • Open Access

    ARTICLE

    Mesoscopic-Scale Numerical Investigation Including the Inuence of Process Parameters on LPBF Multi-Layer Multi-Path Formation

    Liu Cao*

    CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.1, pp. 5-23, 2021, DOI:10.32604/cmes.2021.014693 - 22 December 2020

    Abstract As a typical laser additive manufacturing technology, laser powder bed fusion (LPBF) has achieved demonstration applications in aerospace, biomedical and other fields. However, how to select process parameters quickly and reasonably is still the main concern of LPBF production. In order to quantitatively analyze the inuence of different process parameters (laser power, scanning speed, hatch space and layer thickness) on the LPBF process, the multi-layer and multi-path forming process of LPBF was predicted based on the open-source discrete element method framework Yade and the open-source finite volume method framework OpenFOAM. Based on the design of… More >

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